59

Hydraulics.

Water in the Vessel, and rfierebytionably augments its Spring, ^ ^ ^

Pipe, and also the Mercury will rise till

Shell by the Pressure of the Air on t of the

tSe Equilibrium be restored : An | at as that

Water raised will be nearly 14 > im &

°f the Mercury. . . r , the Air

. 44 - When the Tube S M is ral e ? tg gp r ingydh be comprefs’d within the Barre , ’ g Mercury

'ncreasing, it will act upon the a Water above

the inner Shell, and the Valve L, y a ] ve being

stte Valve I it cannot move, becaue ° p nt on theISut below ; its whole Force is there • ner Shellid Valve E it »>" f »'u^Tof ttotMercury, and drive it down ° d tWn t he Pressure! n the outer Shell, as at a b, ca » inner and outer

tvillbe - —i.pmial. viz*' on . ^fter this

issF ^ __ cd- s and then tm. * .—

j, .. eever y where equal, viz. on the inner and outer!' a nd on the Valve E ; as the Tube after thisref 1,I!UeS tnoving up, the Air will be farther com-s d, and its Springs made greater than that of the0 Air, which therefore it will overcome, andea ru st up the Valve E, till so much has escaped as<j> 5 s the Remainder of an equal Tenour, or in Equi-cur^ W - t!l £ ^ e Atmosphere. The two Shells of Mer-ino-rh W ^ u P on a Level all the while the Air is go-,v '”" u '■ li » Valve, because the Pressure is not greate

1 with the Atmoipnww

v will be upon a Level all the while the Air is gu-o.through the Valve, because thePreflure is not greater

Un than without.

- ~ n»^nr\d Time, the

g through the Valve, __

‘thin than without.

. 45 - By repeating the Operation a second Time, thel ‘ r will be farther rarified, and the Water will again. 111 the Pipe ; and thus on till the Pipe and Barrelf, u .^ as in the common Pump ; and hence ’tis evident‘ 1 £ "t>fe Theorems raised in the preceding Articles,tre , equally applicable here as there. This Pump made«large for Use, should have the following Dimen-wns : The Length of the outer Tube M N = ZOinches ; of the inner Tube X O = 31 Inches ; thediameter of the inner Tube X Y or QO = 6 Inches;

the Thickness of the outer Tube =a As of ah Inch,

. .. of